[PATCH] D17789: [cmake] Check the compiler version first

[Reid Kleckner via llvm-commits]

rnk created this revision.
rnk added a reviewer: beanz.
rnk added a subscriber: llvm-commits.

Otherwise users get messages from CheckAtomic about missing libatomic
instead of a sensible message that says "use GCC 4.7 or newer".

I structured the change along the lines of HandleLLVMStdlib.cmake, which
I'm not sure I like. I'm open to suggestions on how to make sure we do
this check early in LLVM, and do it at some point in the standalone
clang build.

http://reviews.llvm.org/D17789

Files:
  cmake/config-ix.cmake
  cmake/modules/CheckCompilerVersion.cmake
  cmake/modules/HandleLLVMOptions.cmake

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